1. What is Gibbs Free Energy in Electrochemistry?

Definition: Gibbs Free Energy (G) is a thermodynamic potential that measures the maximum reversible work that may be performed by a thermodynamic system at constant temperature and pressure.

Purpose: In electrochemistry, it helps determine the spontaneity of redox reactions in electrochemical cells.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( G \) — Gibbs Free Energy (Joules)
• \( n \) — Moles of electrons transferred (mol)
• \( F \) — Faraday's constant (96485.33212 C/mol)
• \( E_{cell} \) — Cell potential (Volts)

Explanation: The negative sign indicates that a spontaneous reaction (positive Ecell) corresponds to a negative ΔG.

3. Importance of Gibbs Free Energy Calculation

Details: Calculating ΔG helps predict whether a redox reaction will occur spontaneously and determines the maximum electrical work obtainable from the cell.

4. Using the Calculator

Tips: Enter the moles of electrons transferred in the redox reaction and the measured cell potential. Both values are required.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative Gibbs free energy mean?
A: A negative ΔG indicates a spontaneous reaction that can perform work.

Q2: How do I determine moles of electrons transferred?
A: Balance the redox reaction to find the stoichiometric coefficient of electrons.

Q3: What units does this calculator use?
A: The calculator uses SI units: Joules for energy, moles for electrons, and Volts for potential.

Q4: Why is Faraday's constant used?
A: It converts between moles of electrons and electrical charge (Coulombs).

Q5: Can this be used for non-standard conditions?
A: This calculates standard ΔG. For non-standard conditions, use the Nernst equation first.